ext4: get rid of some obsolete EXT4_MB_HINT flags

Since nobody has used these EXT4_MB_HINT flags for ages,
let's remove them.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20250714130327.1830534-7-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Author: LiBaokun96

fs/ext4/ext4.h

@@ -185,14 +185,8 @@ enum criteria {
 
 /* prefer goal again. length */
 #define EXT4_MB_HINT_MERGE		0x0001
-/* blocks already reserved */
-#define EXT4_MB_HINT_RESERVED		0x0002
-/* metadata is being allocated */
-#define EXT4_MB_HINT_METADATA		0x0004
 /* first blocks in the file */
 #define EXT4_MB_HINT_FIRST		0x0008
-/* search for the best chunk */
-#define EXT4_MB_HINT_BEST		0x0010
 /* data is being allocated */
 #define EXT4_MB_HINT_DATA		0x0020
 /* don't preallocate (for tails) */

include/trace/events/ext4.h

@@ -23,10 +23,7 @@ struct partial_cluster;
 
 #define show_mballoc_flags(flags) __print_flags(flags, "|",	\
 	{ EXT4_MB_HINT_MERGE,		"HINT_MERGE" },		\
-	{ EXT4_MB_HINT_RESERVED,	"HINT_RESV" },		\
-	{ EXT4_MB_HINT_METADATA,	"HINT_MDATA" },		\
 	{ EXT4_MB_HINT_FIRST,		"HINT_FIRST" },		\
-	{ EXT4_MB_HINT_BEST,		"HINT_BEST" },		\
 	{ EXT4_MB_HINT_DATA,		"HINT_DATA" },		\
 	{ EXT4_MB_HINT_NOPREALLOC,	"HINT_NOPREALLOC" },	\
 	{ EXT4_MB_HINT_GROUP_ALLOC,	"HINT_GRP_ALLOC" },	\